Product Unbundling in the Travel Industry: The Economics of Airline Bag Fees

This paper provides theory and evidence on airline bag fees, offering insights into a real‐world case of product unbundling. The theory predicts that an airline's fares should fall when it introduces a bag fee, but that the full‐trip price (the bag fee plus the new fare) could either rise or fall. The empirical evidence presented in the paper provides strong confirmation of the first prediction. The data also suggest that the average fare falls by less than the bag fee itself so that the full price of a trip rises for passengers who choose to check bags.     

Intraday data and hedging efficiency in interest spread trading

Three government bond futures contracts and their respective 3-month interest rate futures contracts traded on LIFFE are examined. The data period covers three years of observations, January 1994-December 1996, sampled at half-hourly intervals. Borrowing from the calculation of minimum variance hedge ratios, half-hourly minimum variance spread ratios (the ratio of one contract to another, which provides the minimum variance) are estimated for the above contracts. The hypothesis under examination is whether there is any value-added in estimating minimum spread ratios based on intraday data. Three spread ratios are defined: two ratios calculated from daily data and a third one based on intraday data. Evidence tends to indicate that spread ratios calculated from intraday data exhibit a substantially lower variance than the other two spread ratio speciications. Thus, it is shown that intraday data, in comparison with daily data, allow for lower hedging costs. Moreover, the use of intraday-based spread ratios might be a contributing factor to reducing the maximum cumulative loss potentially incurred while holding a spread position.     

The Location of Comparative Advantages on the Basis of Fundamentals Only

We propose a new way to locate the comparative advantages of two economies linked by international trade. We construct a competitive benchmark based only on the fundamentals of the two economies: endowments, preferences and technologies. The direction of trade is endogenously determined by a linear program with an input-output core. The factor contents of that trade are compared with factor endowments to test the Heckscher-Ohlin model in the presence of different technologies and preferences. We can also evaluate the gains of free bilateral trade. The model is applied to a customs union between Europe and Canada. The Heckscher-Ohlin factor abundance specialization hypothesis is supported by the data.     

Optimal fertility along the life cycle

We explore the optimal fertility timing in a four-period OLG economy with physical capital, whose specificity is to include not one, but two reproduction periods. It is shown that, for a given total fertility rate, the economy exhibits quite different dynamics, depending on the timing of births. If all births take place in the late reproduction period, there exists no stable stationary equilibrium and the economy exhibits cyclical dynamics due to labor growth fluctuations. We characterize the long-run social optimum and show that optimal consumptions and capital depend on the optimal cohort growth factor, so that there is no one-to-one substitutability between early and late fertility. We also extend Samuelson’s Serendipity Theorem to our economy and study the robustness of our results to: (1) endogenizing fertility timing, (2) assuming rational anticipations about factor prices, (3) adding a third reproduction period.     

The biological standard of living and body height in colonial and post-colonial Indonesia, 1770–2000

How did the biological standard of living develop in Indonesia during colonial times? Did it increase substantially after decolonization? In our study, we use four sets of anthropometric data to construct time series of average human height since the 1770s. The paper observes a significant decline in heights in the 1870s, followed by only modest recovery during the next three decades, both of which are related to a sequence of disasters. Average heights increased from the 1900s and accelerated after World War II. The World Economic Crisis, the Japanese occupation and the war of independence in the 1930s and 1940s constituted a difficult period. Average height growth thereafter is related to improvements in food supply and the disease environment, particularly hygiene and medical care.     

Disability Risk Management and Postinjury Employment of Workers With Back Pain

We analyze the outcomes of occupational back pain among four large employers that use one or more of the following disability management practices: aggressive return to work, claims management, medical management, or time‐limited job accommodations. Outcomes measured at 6 and 12 months postonset include: duration of initial work absence and the probability of returning to stable employment. Employment outcomes are better in firms with more proactive return‐to‐work policies than in firms with more restrictive policies. We devise a statistical test for attrition bias and conclude that sample attrition does not significantly alter our results.     

Inference on vertical contracts between manufacturers and retailers allowing for nonlinear pricing and resale price maintenance

We present a model of vertical contracts between manufacturers and retailers with nonlinear pricing strategies. Using home‐scan data on bottled water produced by manufacturers and sold by retail chains in France, we estimate a structural demand and supply model allowing for two‐part tariff contracts between manufacturers and retailers. Using price‐cost margins recovered from estimates of demand parameters, we select the best supply model by performing nonnested tests, and find that manufacturers use two‐part tariff contracts with resale price maintenance. We then perform counterfactual policy simulations that restrict the use of these vertical contracts and assess welfare effects under alternative scenarios.     

Pareto-Improving Social Security Reform

It is generally accepted that moving from an unfunded to a funded social security system implies a welfare loss for the transition generation—that is, the generation that has to pay twice: first, saving for its own retirement and, second, contributing to the pensions of the then retired generation. This article shows that in a setting of endogenous growth with positive externality such a transition can be Pareto improving. But it argues also that social security reform is more a pretext than a requirement for internalizing such a positive externality.     

Decentralization and growth: what if the cross-jurisdiction approach had met a dead end?

The relationship between decentralization and economic growth is generally studied from a perspective stressing universal or quasi-universal regularities across jurisdictions. That approach has generated many insights but seems to reach its limits. The paper explains why it allows contrasting positions with regard to the benefits of decentralization even among proponents of free and competitive markets. And it seems from the empirical literature that no robust and economically significant cross-jurisdiction relation between decentralization and economic performance or growth, except perhaps their independence, has been found. The absence of a relation valid across jurisdictions, however, does not entail the absence of relations specific to each. When jurisdiction specificity is very strong, it is normally difficult to say if there is a relation between observable decentralization arrangements in a jurisdiction and its observable economic performance. However, this may be different under particular circumstances reflecting disequilibrium. Episodes of growth acceleration, when they follow persistent underperformance and include changes in decentralization arrangements, may provide some empirical support to the claim that the relation exists.